пт, 5 окт. 2018 г. в 12:36, Karl Ove Hufthammer <karl@xxxxxxxxxx>:
Hi!
I use my NVIDIA graphics card as a combined graphics and sound card,
connected to my 5.1 home theatre system via an HDMI cable (something
which works surprisingly well). Using the default audio profiles in
‘pavucontrol’, I can easily switch between 5.1 sound (e.g. for DVDs) and
stereo sound, which is great.
Hello!
I think you forgot to specify the version of PulseAudio...
The 5.1 profile (‘hdmi-surround-extra1’) also work fine for *some*
stereo material, mainly music. But for *most* stereo material, the
upmixing makes everything sound too echoey (this is typically a problem
for movies with just stereo sound and for vocal-heavy music), so I
usually just use the stereo profile (‘hdmi-stereo-extra1’) for stereo
material.
There is a setting that prohibits upmixing (i.e. filling the rear channels with a copy of front). It is called remixing-use-all-sink-channels=false. But it is a relatively recent addition. It does exist in Ubuntu 18.04.
But I have noticed than when playing music or videos using the stereo
profile, the sound is missing quite some oomph, i.e. the bass is *much*
weaker (compared to the same material played using the 5.1 profile).
I guess the reason is that PulseAudio outputs a pure stereo sound, and
my home theatre system doesn’t redirect enough of the low-frequency
sound to my subwoofer. And unfortunately, my (not too expensive) home
theatre system doesn’t have any options for increasing this (for HDMI
audio).
Are you sure that the subwoofer gets anything at all in this mode?
Anyway the suggestion is to try the 5.1 profile and remixing-use-all-sink-channels=false.
Alexander E. Patrakov
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